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Problem
• We want to know about the students shoe size in IX D.
Identification Process
• We collect the data by observation (by asking one by one)
Collected Data
NO Name Size
1 Adit 40
2 Ahmad 42
3 Altafiyani 41
4 Annisa 40
5 Dina 37
6 Emilia 40
7 Ghaisani 37
8 Gina 39
9 Hani 37
10 Hilya 42
11 Ikhram 43
12 Ilmi 37
13 Jody 42
NO Name Size
14 Kezia 41
15 Lisana 37
16 Madiha 39
17 M. Farhan 42
18 Mutiara 40
19 Nurcholish 42
20 Nurhaliza 37
21 Nurmaulida 38
22 Nynsca 39
23 Sofie 40
24 Weby 37
25 Wini 40
PopulationThe population is all students in IX D
SampleNo sample, because the data is not too
numerous and we collect data by observe all students in IX D (as population)
Sorting Data
The data is still random, so we have to arrange the data:
37 = 7 students
38 = 1 student
39 = 3 students
40 = 6 students
41 = 2 students
42 = 5 students
43 = 1 student
Highest value = 43
Lowest value = 37
Mean
Shoe Size 37 38 39 40 41 42 43
Frequency 7 1 3 6 2 5 1
Mean =
=
=
=
= 39.56
Mode
Shoe Size 37 38 39 40 41 42 43
Frequency 7 1 3 6 2 5 1
The highest frequency = 7 (which are the shoe size is 37)
Mode = the data which have high frequency
= 37
Median
n = number of data = 25
The ... data =
=
= = 13th
The 13th data is 40.
So, median of the data is 40.
Shoe Size Frequency The ... data
37 71st,2nd,3rd,4th,
5th,6th,7th
38 1 8th
39 3 9th,10th,11th
40 6 12th,13th,14th,15th,16th,17th
41 2 18th,19th
42 5 20th,21st,22nd
,23rd,24th
43 1 25th
Range
After sorting the data, we know that:
Highest value = 43
Lowest value = 37
So, the range is = Highest value – Lowest value
= 43 – 37
= 6
Quartiles
Quartile 2 (Q2) = median of the data (the 13th data)
= 40
Quartile 1 (Q1) = the middle of the lowest value and Q2
The ... data =
= = 7th
So, Q1 is the 7th data = 37
Shoe Size 37 38 39 40 41 42 43
Frequency 7 1 3 6 2 5 1
The...data 1st,2nd,3rd,4th,5th,6th,
7th
8th 9th,10th
,11th
12th,13th,14th,15th,16th,17th
18th,19th 20th,21st,22nd,23rd,
24th
25th
Quartiles
Quartile 3 (Q3) = the middle of Q2 and the highest value
The ... data =
=
= 7 from 13 (Q2) = 19th
So, Q3 is the 19th data = 41.
Shoe Size 37 38 39 40 41 42 43
Frequency 7 1 3 6 2 5 1
The...data 1st,2nd,3rd,4th,5th,6th,
7th
8th 9th,10th
,11th
12th,13th,14th,15th,16th,17th
18th,19th 20th,21st,22nd,23rd,
24th
25th
Chart
Bar Chart
0
1
2
3
4
5
6
7
8
37 38 39 40 41 42 43
The
nu
mb
er
of
stu
de
nts
Shoe Size
Shoe Size in IXD
Line Chart
0
1
2
3
4
5
6
7
8
37 38 39 40 41 42 43
Student Shoe Size in IXD
Pie Chart
28%
4%
12%24%
8%
20%4%
Student Shoe Size in IXD
37
38
39
40
41
42
43
Pictogram Chart
• 37 :
• 38 :
• 39 :
• 40 :
• 41 :
• 42 :
• 43 :
Conclusion
In our opinion, the most appropriate diagram forour data which is the data of the students shoe size in9D is a bar chart. Because, in addition to a bar chart iseasy to read and made, it is also very suitable topresent data that include the amount. Compared withother diagrams created difficult and less fit to presentdata that include the amount.
